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4.4 Compressive Strength

Figure 6 Differences in Compressive Strength between Brick Each

From the figure above the highest strength was recorded by a 4% brick coconut shell mixture while the lowest was recorded by a
2% brick coconut shell mixture. The specimen-controlled child's preparation process recorded results exceeding the JKR standards.
The graph above shows that the use of coconut shells affects the strengthening of strength.

4.5 Cost of Product

This brick is made by sand, cement and coconut shell. Researcher the list of material and tools has be done in factories producing
bricks. The materials to be used have been selected to conduct this study. Cement to be used are Portland cement, the current market
price for cement is RM 18.00 for 50 kg. Besides that, fine sand price is RM130.00 for a lorry and coarse sand is RM 100.00 for a lorry.
For coconut shell not have cost because the researcher take a coconut shell from the dump site of coconut shell at Pasar Besar,
Seremban, Negeri Sembilan. Estimated value the size of coconut shell that has been crushed is 3.38 mm. The total cost used to prepare
this brick based on table 3.4. Besides, the cost of production of CS bricks with additives is cheaper compared to ordinary bricks
available in the market.

5. Conclusion

Most of the concrete bricks made by the researchers manually record the uniform size dimensions and permissible tolerances. The
density of the concrete brick control and modification varies depending on the ratio of the mixture used but all samples have a normal
density of concrete bricks that are stabilized by cement. The use of coconut shells has an effect on increasing the density of a brick at
the same time indicating an increase in the degree of workability of the blend. Moist absorption rates for all study bricks are at a
satisfactory level according to their use. The type of sand is also a dominant factor affecting the moisture absorption rate of a concrete
brick. Generally all study bricks recorded the lowest normal compressive strength of cement stabilized concrete bricks. The use of
coconut shells affects the increased strength of compression. The use of coconut shells as a whole has a positive effect on the
improvement of physical and mechanical performance of concrete bricks. The type and nature of sand used greatly influence the
physical and mechanical properties of concrete bricks.

References

Noorhaya Kasa (2015). “A Study of Optimum Coconut Shell (Cs) Ratio in Cement Sand Bricks”. Universiti Malaysia Pahang.
Pranav, D., & Vikas, S. (2017). “Solid Waste Management by Using Coconut Shell Powder as an Aggregate”. Material in Construction
Bricks International Journal of Scientific & Engineering Research, Volume 8, Issue 4, April-2017
Siti Aminah, T., & Sabarudin, M. (2019). “Investigate The Combination Of Coconut Shell And Grind Palm Kernel To Replace
Aggregate In Concrete: A Technical Review”. National Conference on Postgraduate Research (NCONPGR) 2009, pp 49-58.

Umi Hani Abdul Rahman. Tel.: +0107811774; Fax: 066622026
E-mail address: umihani@polipd.edu.my
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